Can I download diffrent poses?
mixamo.com is one way to get poses. (It's free to use you just need to register with a mail address.) There you can download pre-made characters and animations/poses. Alternatively, you can upload your own model (without textures), apply an animation and download it again. Export the model in obj or fbx format in Blender. Make sure there are no messed up UV maps or materials. This may cause the export and import to fail.
If you found a pose, download it and re-import it back to Blender. There you can re-apply the textures OR you can delete all the mesh and just keep the armature. Then parent the mixamo armature with your original mesh (re-skin).
Another way is to use bvh files (motion captures). Blender supports these files and you can import them for poses.